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Why so few animals are blue

Quick! Name an animal that’s blue––even a little bit blue. How many did you come up with? Probably butterflies, because they’re in the image to this video. Maybe you got bluejays, and maybe even peacocks. There are some blue insects, too. So blue animals are pretty rare, which is interesting in itself. But try this on for size: only one species of butterfly has blue pigment. In every other blue critter, the blue color comes from physical structures! So for butterflies, for example, the physical structure of the wing filters out all light except blue. Same with peacock feathers.

Full story at YouTube.

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